Valve-hole-punching machine for inner tubes



March 22 1927.- H. D. STEVENS 2% 56) VALVE HOLE PUNQHING MACHINE FOR INNER TUBES;

Filed June 12. 1922 2 Sheets-Sheet 1 H97?) e D0 Slew ens H. i STEVENS VALVE) HOLE PUNCHING MACHINE FOR INNER TUBES Filed June 12, 1922 2 Sheets-Sheet 2 v nue lot Hawaee B fileriw thus speeding up thework and lessening the Patented UNITED STATES PATENT OFFICE.

Homer: 1); sriivnns, or Anson. onio. AssIenon TO THE FIRES-TONE TIRE aim ra se nit ooiuraNY, or AKRON, OHIO, A' CORPORATION or OHIO.

VAiVE-HOLE-PUNCHINGMACHINE son INNER TUBES.

' Application filed June 12, 1922.- Seria1'No;'567,563.

Prior to'this invention it was customary in the manufa'ctui'e'of inner tubes for pneumatic tires, to form the hole, through which the valve stem was inserted, by hand before the ends of the tube were joined or spliced. This operation was performed by two work- 'men who laid anumber of tubes on a table I in parallel relation.

One of the workmen would insert boards or sticks in the mouth of a tube while the other, with a hand .punch. and mallet, made the holes in the tube. This primitive method has endured until the introduction of the present invention, the ob-' ject of which is to produce'a machine to punch these valve stem holes in inner tubes,

labor required for the operation.

In the drawings and description accompanying this application is shown one embodiment of the invention, but it will be understood that the showing and description are not to be considered as limiting the scope of the invention beyond the requirements of the prior art and within the substance of the, appended claims.

In the drawings: f

Figure 1 is a side elevation of the machine;

Figure 2 is an end elevation, a portion of the head being removed;

Figure 3 is a vertical section through the head;

Figure 4 is a sectional view of the punch. The apparatus comprises a platform or base 1 on which is mounted the motor 2 for driving the apparatus which may be connected to any source of power by flexible cables (not shown). The platform is preferably mounted on casters or rollers 3 so that the apparatus may be moved about the factory to the location of the tubes on which it is intended to operate. This arrangement 'is advantageous as it does away with trucking the tubes.

From the platform 1 rises a standard or column 4 which is of sufiicient height to enable the unching operation to be carried on expeditiously. Near the ,top' of the standard there is arranged a horizontal arm 5, which may be constructed from a hollow piping, and in the outer end of'which is carried a removable anvil or work rest 6,

usually composed of a hardwood so as to eiiough so that the tube maybe slipped over it for a considerable distance in order. that the valve stem hole may not come too near to the splice. I

Above and parallel to the arm 5 is a second arm 7, at a convenient point on which is-carried a block 8 which pivotally supports a rocking lever 9, normally held in raised position by aspring-lO. To the inner end of the lever 9 is attached a link 11, which extends downward through the platform and is connected at its lower end to a foot treadle 12 pivoted in a hanger 13 depending fi'om the lower side of the platform;

On the'end' of the arm 7 is carried a stationary head 14 in which is mounted a vertically rec'iprocable and rotary shaft 15, the

at 18 and engages aloose collar 19 held between collars 20 secured on the upper end 'ofshaft 15. An adjustable pin 21 is carried in the end of the lever 9 being adapted punched in the tube. The punch or cutting I element 23 is hollow so that the disks of 1 rubber may be forced upwardly therein, the upper end of the punch communicating with a recess 24 vented at 25 to the outer surface of the shaft. A deflecting plug or ejector 26, having an inclined surface facing toward opening 25, is located in the recess 24'and serves to direct the cut-out disks toward the opening wherethey are discharged. A U- shaped stripper plate 27 depends from the head, being provided with. ,an-aperture 28 1.

operates to strip the tube from the-cutting through which the tool is projected, and

tool.

The operation of the-apparatus iseasily understood. The operator takes a bunch of tubes, the ends of which have not been n spliced, and passes one end over the arm 5 until the anvil 6 is at the point desired for the valve stem hole. He then depresses the claims attached hereto.

What I claim is:

1. An apparatus for punching valve stem holes in inner tubes comprising an elongated arm adapted to receive an inner tube thereover, an imperforate anvil on the end ofsaid arm, a rotary punch above the anvil, and means to depress the punch.

2. An apparatus for punching valve stem holes in inner tubes comprising an elongated arm adaptable for insertion within the inner tube, an imperforate anvil on the outer end of the arm, a rotary and reciprocable cutv ejector at the tin tool above the anvil, and means for rotating and depressin the cutting tool.

3. An apparatus 0 the character set forth comprising the combination of an elongated arm adaptable for insertion within an inner tube, an anvil on the outer end of said arm, a stationary head above the anvil, a rotary and reciprocable tool in said head said tool being hollow, an ejector above said tool, means for moving said tool longitudinally of the head, and rotary driving means for the tool.

4. In an apparatus for the uses and purposes set forth a movable platform, a standard rising from said platform, parallel arms extending from said standard one of said arms being adaptable to receive an inner tube, a replaceable anvil in the end of said arm, a head on the end of the other arm, a rotary and reciprocable shaft in said head,

a lover by which the shaft may be reciprocated, a punch in the end of said shaft over the anvil said punch being hollow, and an upper end of said punch.

HORACE D. STEVENS. 

